I learnt about this from my contractor too, but I noticed some of my friends were not aware of this and did not done it right for their house. They are suffering from the flicker effects.
You should position your ceiling lights far away from the ceiling fan. This is because if the fan is close to the lights, when its blades is moving, it will have shadow under the light, causing the room to have a flickering lighting effect, which is irritating and bad to your eyes.
If the room is small and there is a ceiling fan on top, you'd better opt for wall lights instead of installing ceiling lights.
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